Members of the Boston Police Patrolmen's Association and their allies form a picket line outside the FleetCenter in Boston late Monday evening. The police union, which is the most outspoken of the city's unions in their long-simmering dispute with Boston Mayor Thomas Menino, has been working without a contract for two years. Union protests could delay preparations at the convention site where Democrats will gather next month to nominate a presidential candidate, with telecommunications workers saying they won't cross police pickets to get inside. (AP Photo/Elise Amendola)